1981-01-23
1983-07-12
Rosenberger, R. A.
350266, 33243, 33251, F41G 114
Patent
active
043927238
ABSTRACT:
An aiming device has arranged in a tubular housing an adjustable iris diaphragm, a polarizing filter and a number of color filters. The color filters are mounted on a filter disc which is rotatably supported in the housing and provided with circumferential gear ring engaged by internal gearing of a knurled ring surrounding the housing. The polarizing filters are supported on arms with which they can be pivoted out of the line of sight of the view finder and by which they can be rotated relative to each other when they are in the line of sight of the view finder. A second knurled operating ring engages the polarizing filter support arms for actuation thereof. The iris diaphragm consists of a slotted sleeve having a conical end disposed in a conical cavity of the housing. A knurled third ring is threaded onto the housing and engages the sleeve for forcing it into the conical cavity for reducing the open diameter of the iris diaphragm. The three knurled rings are disposed adjacent each other and surround the housing, the intermediate ring being preferably slightly larger than the outer rings to facilitate handling.
REFERENCES:
patent: 807712 (1905-12-01), Bassell et al.
patent: 1198888 (1916-09-01), Bullen
patent: 3456351 (1969-07-01), Gehmann
Bach Klaus J.
Rosenberger R. A.
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